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Private LTE Signal Propagation Underground

Advanced LTE communication experts supporting communication and data systems (5MHz and 4.3GHz) for underground applications.

The LTE BDA system works similar to an existing underground two-way radio system. The design rules are based on length of run and splitters inserted in the path.
METStech work with multiple vendors hardware such as LTE cores and two way repeaters.

METStech – BDA Specialists


METStech designs and manufactures leading-edge Bi-Directional Amplifiers (BDAs) for the propagation of virtually all communications technologies. Their LTE over leaky feeder solutions allow LTE and two-way radio networks in tunnels and underground mines to be extended over many kilometres.

A bit about METStech


METStech designs and manufactures specialized BDA systems with extremely low latency for communication equipment.

Founded in 2014 by a group of highly experienced engineers and managers with more than 50 years of collective experience in the design, building, and support of advanced communications systems, the company has grown into one of the world’s leading suppliers of communications solutions and equipment for underground mines and tunnels.

Key Features and Benefits:


LTE BDA100% coverage is achievable in underground mines for LTE and is installed in a similar way to two-way leaky feeder systems. 

VHF / UHF BDADual-purpose VHF/LTE or UHF/LTE BDAs are available, allowing single cable support for both two-way and LTE communications.

Communications signal is amplified and propagated up to +12dBm.

HEADEND OPTIONSBDAs can be linked together, providing lateral coverage along the length of a radiating cable.

RADIATING CABLECoverage can be extended over many kilometres by connecting BDAs to the end of the radiating cable.

SETUP AND MONITORINGVery low latency, no need for expensive fibre-fed picocells 

 The radiating cable is terminated with a standard N-type connector, and BDAs are inserted every 150-300m, depending on frequency. Any electrician who has experience with existing two-way BDA systems will be able to install an advanced LTE solution.

Compatible with LTE cores, two-way repeaters, and other hardware from a wide range of vendors.

Works in a similar way to existing underground two-way radio systems, making it simple to design.


At RAMJACK Technology Solutions, we offer solutions from METStech to clients in Africa, Europe, the Middle East and Latin America.